This Sept. 17, 2013 photo shows American musician Linda Ronstadt poses in New York to promote the release of her memoir “Simple Dreams.” (Photo by Amy Sussman/Invision/AP) by John CarucciAssociated Press Writer NEW YORK (AP) — These days, it’s hard for Linda Ronstadt to get around without her forearm crutches. The debilitating effects of Parkinson’s disease require her to relax for a few minutes before starting an interview. But once she’s ready, the 67-year-old has full command of her voice, even though she’s no longer able to sing.